Diogenes of Apollonia. ii.

Xenophanes speaks thus:—

And no man knows distinctly anything,

And no man ever will.

Pyrrho. viii.

Democritus says, "But we know nothing really; for truth lies deep down."

Pyrrho. viii.

Euripides says,—

Who knows but that this life is really death,

And whether death is not what men call life?